This isn't exactly a BB cream, but bareMinerals' Complexion Rescue could be worth a shot. I wear the palest shade (Opal 01) & it's a good match for me - I'm fair (possibly porcelain) with cool/pink undertones. If you're super duper pale it might be too dark though. The Complexion Rescue is more light, but can be built to light-medium I guess + it's easy to apply with your fingers.

I think any Korean bb/cc cream/cushion should work for you shade wise. Depending on which one they can have quite decent coverage.
And they're quite accessible online. You can't test it obviously but just get the lightest shade. And check online reviews/swatches.

if you could provide your nearest shade match in either Mac or something easily identifiable? Also your undertone (cool/pink, warm/yellow or neutral/beige)

Heaps of Korean ones are pale enough and I am very pale and the reason I got into Korean products was they were the only ones who made bb creams pale enough. Also look at cushion bb's if you want fast application